Shock absorber for the balance staff of watches



May 5, 1942.

G. ERlsMANN 2,282,122

SHOCK ABSORBER FOR THE BALANCE STAFF` 0F WATCHES Filed Oct. 7, 1940 1011 7 i2 9 f6 ZMS/p;

f mamy/272 Patented May 5, 1942 1 SHOCK ABSORBER FOR THE BALANCE STAFFOF WATCHES Grard Erismann, Neuveville, ,Switzerland Application October7, 1940, Serial No. v360,181 InYSwitzerland October 30, 1939 .5 Claims.

a whole `with said setting and comprising a spiral spring and anotherring in which said jewel-is setand which forms the inner end of saidspiral spring.

A further object is to make the setting in one piece with said ring orto force the latter into said setting.

Still another object is to provide a second setting placed on the rstsetting and made in one piece with a second elastic arrangement beingsupported on the cap-jewel. In a special embodiment this second elasticarrangement can f be made in one piece with the cover plate.

Other objects and features will be apparent as the following descriptionproceeds, reference being had to the accompanying drawing in which Fig.l is a vertical section through the balance staff of an embodiment;

Fig. 2 is a top view with cover plate, index and cap-jewel removed,

Figs. 3 and 4 are vertical sections through the balance staff of otherembodiments.

In the embodiment shown in Figs. 1 and 2, I represents the iiat part ofthe balance-cock to which a cover plate 2 is screwed; the index 3 tting,as usual, the circumference of this cover plate. An aperture is providedon the cover plate in which, by insertion of a. collet 4 and exibletongues 5 forming the object of a former invention, a cap-jewel 6 isheld, serving the purpose of absorbing the axial component of the Ashocks to which the balance staff is exposed.

The arrangement according to the present invention is intended to absorbthe radial cornponent of these shocks. It comprises a setting 8, anelastic member consisting of a ring 9 and of a spiral spring I0 endingin a ring H, and a perforated jewel I2. The setting 8 is inserted into acircular recess of the part I and is supported on the bottom of saidrecess. The perforated jewel I2 is set in the ring Il, which is in thecenter of the elastic member. In this (Cl. .5S-140) embodiment the twoportions of the elastic member, zviz.: the spiral spring I0 and the ring9 are made in one piece with the setting 8. The ring A9 could, however,just as well be forced into the setting 8 or xed to the setting in anyother sui-table way.

I'Itis understood that the elastic member may .be-diiferentffrom thatabove described and illustrated. flteould, for instance, -have any formyoft-he larrangements shown -in the Swiss Patents l;S6,317,-92,767,192,768. f .Int'iiig 13van vexample is illustrated, which isdistinguished by the feature that the setting of fthe elastic memberprarrangement carries aseo- 15 rond setting. A .secondlelastici member,being supported on the capjeweLis Lmade in :one piece Lwi'th thissecond'fsetting 'In this'Fig. 3, II again represents the fiat part ofthe balance cock, into a recess of which the setting 8 made in one piecewith the spiral spring I0, is inserted` The center of this spiral springis formed as a ring into which a perforated jewel I2 is set, which, inits turn, serves as a bearing for the balance staff 1. A second settingI3 is fitted to the setting 8 with the help of a rim I4. The center partof this second setting I3 is formed by elastic lamellae constituting aspring, the cap-jewel being located under these lamellae. The number ofthese lamellae I5, disposed along radii of the setting, varies fromthree to six` These lamellae absorb the axial shocks to which thecapjewel is exposed. Together with the setting carrying them, theyconstitute a second elastic member or arrangement completing the oneformed by the spiral spring I0 and the perforated jewel I2. The tting ofthe setting I3 to the setting 8 being rather close, the two devices forma handy whole which, as a single piece, can, accurately centered, beinserted into the corresponding recess of the part I. The whole is keptin place by the cover plate 2. The cap-jewel 6, on its circumference, isso thick that it does not cant or fall out of the setting I3 whateverthe shock, to which the timepiece in the direction of the 7 shaft axisand away from the bearing is subjected, may be.

In the embodiment illustrated in Fig. 4 the same parts are seen as inthe preceding one. 'Ihe first elastic member or arrangement absorbingthe radial shocks is, also in this embodiment, formed by the spiralspring IIJ made in one piece with the setting 8. 'Ihe second elasticarrangement is formed by the lamellae 2l made, in this case, in onepiece with the cover plate 20 forced into the setting 8 of the rstelastic piece in the direction of the shaft axis and away from thebearing is subjected, may be. WhatI claim is: l. In a watch, a balancestaff, a jewel adapted to hold said balance stai pivotally, a balancecock comprising a at part, a hollow on said t flat part, a settinglodged in said hollow, an elastic arrangement forming a whole 4With saidsetting, a ring disposed in the center of said elastic arrangementforming a Whole with said jewel, a cap-jewel, asecond setting placed onsaid setting, a second elastic arrangement made in one piece with saidsecond setting and adapted to press against said cap jewel.

2. In a watch, a balance stai, a jewel adapted to hold said balancestaff pivotally, a balance cock comprising a at part, a hollow in saidat part, a setting lodged in said hollow, an elastic arrangement forminga whole with said setting, a ring disposed in the center of saidelasticarrangement andadapted to receive said jewel, a cap-jewel,v a secondsetting fitted into said setting, a second elastic arrangement made inone piece with said second setting and adapted to press against said capjewel. 1' I Y v 3. In a watch,l a balance staff,y a jewel adapted 4. Ina watch, a balance stai, a jewel adapted to hold said balance staffpivotally, a balance cock comprising a flat part, a hollow in said flatpart, a setting lodged Iin said hollow, an elastic arrangement forming awhole with said setting, a ring disposedin the center of said elasticarrangement and adapted to receive said jewel,

a cap-jewel, a cover plate fitting said setting, a second elasticarrangement made in one piece with said cover plate and adapted to pressagainst said cap-jewel, said cover plate and said setting beingconnected with one another in such a way as lto form a whole centered insaid hollow by means of the circumference of said setting` 5. In awatch, a balance staff, a jewel adapted to hold said balance staffpivotally, a balance cock comprising a iiat part, a hollow on said flatpart, an elastic member, a setting surrounding said elastic member andintegral with and of greater thickness than said elastic member andextending beyond both front faces of said elastic member and lodged insaid hollow, and a ring disposed in the center of and integral with saidelastic member and adapted to receive said jewel.

GRARD ERISMANN.

